Bold prediction for the Pac-12: UCLA is in a position to shock the conference and perhaps the country on signing day. Already in possession of a top-12 class, the Bruins have a chance to close with a bang, as UCLA is in a good position with ESPN 150 prospects Eddie Vanderdoes, Isaac Savaiinaea and Asiantii Woulard. If all goes well in Westwood on signing day, Jim Mora could finish the day with a top-five recruiting class.

Biggest need: Linebacker. Arizona’s defense is in need of some immediate help in all three levels, but the Wildcats will add some serious depth at linebacker with five commitments at the position.

Biggest recruit: QB Jesse Scroggins. A case could be made for either quarterback commitment -- Anu Solomon is the other -- but with Scroggins’ experience at USC and his status as an early enrollee, he could have an advantage when it comes to battling for the vacated starting quarterback spot.

Biggest need: Secondary. Arizona State is set to add plenty of help at the offensive skill positions, but the Sun Devils needed to add depth on the defensive side of the ball, and they did so. Safeties James Johnson and Jayme Otomewo are strong additions, as are cornerbacks Damarious Randall and Will Earley.

Biggest recruit: DT Marcus Hardison. Getting defensive tackle Will Sutton back for another year was a big win for Arizona State’s defense. Getting the No. 5 junior college player in Hardison, a 6-foot-4, 275-pound defensive tackle who can help Sutton inside this year, is another big win.

Biggest need: Offensive line. With head coach Sonny Dykes and offensive coordinator Tony Franklin, Cal is looking to take off offensively, but that can’t happen without a dominant front. Six offensive line commitments, including four-star tackles Aaron Cochran and Erik Bunte, are a good way to continue building up front.

Biggest recruit: OT Aaron Cochran. This is true figuratively and literally. Cochran, at 6-foot-8 and 364 pounds, is an important recruit for Cal, as the offensive tackle plays a position of need. He is the younger brother of Cal lineman Matt Cochran. Honorable mention here to Cameron Hunt, who committed to Cal last summer but opened his recruitment after the coaching change and now appears to be headed to Oregon.

Biggest need: Offensive line. The Buffaloes need help everywhere, but solidifying the offensive line is step one for the new regime. Colorado holds commitments from five offensive linemen as it looks to take a step forward in the Pac-12.

Biggest recruit: QB Sefo Liufau. While building along the lines is important, Colorado needs to add playmakers at every position, and Liufau is definitely that at quarterback. He understands and appreciates the challenge at Colorado and is the kind of player the Buffs need to bring in and build around.

Biggest need: Running back. While the Ducks have been blessed with an embarrassment of riches at tailback, it’s important that they continue to stock the cupboard in order to keep finding those gems and running the blur offense. Three tailbacks were a possibility in this class, as there will be an opportunity for playing time.

Biggest recruit: RB Thomas Tyner. This was big on two fronts as Tyner has an opportunity to contribute as a freshman, and the Ducks were able to keep Oregon’s top recruit from leaving the state. Tyner’s commitment became even more important when Dontre Wilson flipped from Oregon to Ohio State on Monday.

Biggest need: Defensive line. The Beavers looked to get bigger and better up front and did so in a big way. Six defensive linemen are headed to Corvallis, including four junior college defensive tackles capable of playing as soon as they arrive on campus.

Biggest recruit: CB Dashon Hunt. Oregon State needed to add talent in the secondary as well and Hunt -- the Beavers’ lone ESPN 300 commitment -- will help there. Hunt’s commitment also helped Oregon State continue its presence in Southern California, which it recruited extremely well with this class.

Biggest need: Wide receiver. The Cardinal needed to add receiving threats in this class, and adding wide receivers Francis Owusu and Taijuan Thomas did that. Of course, at Stanford, no position poses more of an offensive threat than tight end, and the Cardinal have commitments from three high school standouts who will suit up there.

Biggest recruit: WR Jordan Cunningham. As the Cardinal continue to hunt for pass-catchers in this class, snagging Cunningham -- an ESPN 150 wide receiver -- on signing day would nicely cap an undermanned but still impressive recruiting class. It would also carry over Stanford’s terrific signing-day success from last year.

Biggest need: Offensive line. While it might not be the most immediate need for the roster, the UCLA coaches saw a need to infuse the offensive line with young talent and they went out and did just that. There are offensive line recruits, including two ESPN 300 prospects and a third four-star lineman.

Biggest recruit: DT Eddie Vanderdoes. The country’s top defensive tackle will announce at 5 p.m. PT and the Bruins are thought to be in good position. Landing Vanderdoes -- a former USC commitment -- would be another positive sign for the Bruins in their quest to tip the rivalry in their favor.

Biggest need: Secondary. The Trojans have been shaky in the secondary for several years now and are in need of players capable of adding depth and perhaps playing as freshmen. Signing day could offer a disappointment if cornerback Jalen Ramsey goes elsewhere, but the early enrollee group of safeties Su’a Cravens and Leon McQuay and cornerback Chris Hawkins, gives the Trojans three players capable of stepping in and offering a solution to the pass defense troubles.

Biggest recruit: S Su’a Cravens. USC is set to add plenty of impact players in this recruiting class, but landing Cravens as an early enrollee was huge. A local player who plays a position of need and has the talent to make an impact as a freshman, Cravens was as close to a must-get recruit as the Trojans had in this class.

Biggest need: Running back. With John White finished at Utah, the Utes have just one player returning in 2013 who logged more than 25 carries last season. While there are several tailbacks on the roster, Utah looked to add talent at the tailback position in this class and did so with four commitments from running backs, including junior college back Devontae Booker.

Biggest recruit: DT Lowell Lotulelei. There is no guarantee that the defensive tackle will turn into his older brother, Star Lotulelei, a likely top-five pick in the upcoming NFL draft. But getting a commitment from Lowell Lotulelei was arguably the most important piece of Utah’s recruiting puzzle. The four-star defensive tackle is Utah’s top-ranked commitment and will look to take over where his brother left off.

Biggest need: Offensive line. The Huskies hoped to find several big bodies to position as the future of the offensive line in this class and have commitments from three high school linemen, including four-star center Dane Crane. While the Huskies lost a commitment from Sean Harlow, who flipped to Oregon State, they could make up for it in a big way by grabbing ESPN 300 tackle Nico Falah away from USC on signing day.

Biggest recruit: WR Damore’ea Stringfellow. The highest-ranked player in the class, the ESPN 150 wide receiver is a playmaker capable of providing an immediate spark for Washington’s offense. He also gives the Huskies a big recruiting win in Southern California, as he was sought after by UCLA and USC.

Biggest need: Offensive line. While much of the attention with Mike Leach’s offense goes to the offensive skill players, it can’t take off without an effective offensive line. Six offensive linemen, including junior college tackle Jacob Seydel, are headed to Pullman in this class.

Biggest recruit: QB Tyler Bruggman. The Cougars won a big recruiting battle for Bruggman, as they were able to pull him away from hometown Arizona State. He was someone Washington State targeted early on as a player who could fit into and succeed in the offense.